<template>
    <div class="upload-file">
      <el-upload
        multiple
        :action="uploadFileUrl"
        :before-upload="handleBeforeUpload"
        :file-list="fileList"
        :limit="limit"
        :on-error="handleUploadError"
        :on-exceed="handleExceed"
        :on-success="handleUploadSuccess"
        :show-file-list="false"
        :headers="headers"
        class="upload-file-uploader"
        ref="fileUpload"
      >
        <!-- 上传按钮 -->
        <el-button size="mini" type="primary">选取文件</el-button>
        <!-- 上传提示 -->
       
      </el-upload>
  
      <!-- 文件列表 -->
      <transition-group
        class="upload-file-list el-upload-list el-upload-list--text"
        name="el-fade-in-linear"
        tag="ul"
      >
        <li
          :key="file.url"
          class="el-upload-list__item ele-upload-list__item-content"
          v-for="(file, index) in fileList"
        >
          <el-link :href="file.url" :underline="false" target="_blank">
            <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
          </el-link>
          <div class="ele-upload-list__item-content-action">
            <el-link :underline="false" @click="handleDelete(index)" type="danger"
              >删除</el-link
            >
          </div>
        </li>
      </transition-group>
    </div>
  </template>
  
  <script>
  import { getToken } from "@/utils/auth";
  
  export default {
    name: "FileUpload",
    props: {
      syncedMessage: {
        type: Object,
      },
  
      // 值
      value: [String, Object, Array],
      // 数量限制
      limit: {
        type: Number,
        default: 5,
      },
      // 大小限制(MB)
      fileSize: {
        type: Number,
        default: 5,
      },
      // 文件类型, 例如['png', 'jpg', 'jpeg']
      fileType: {
        type: Array,
        default: () => ["doc", "xls", "ppt", "txt", "pdf", "png"],
      },
      // 是否显示提示
      isShowTip: {
        type: Boolean,
        default: true,
      },
    },
    data() {
      return {
        number: 0,
        uploadList: [],
        uploadFileUrl: process.env.VUE_APP_BASE_API + "/purs/file/upload", // 上传文件服务器地址
        headers: {
          Authorization: "Bearer " + getToken(),
        },
        fileList: [],
        id: "",
      };
    },
    created() {
   
      this.id = this.syncedMessage.id;

    },
    watch: {
      value: {
        handler(val) {
          if (val) {
            let temp = 1;
            // 首先将值转为数组
            const list = Array.isArray(val) ? val : this.value.split(",");
            // 然后将数组转为对象数组
            this.fileList = list.map((item) => {
              if (typeof item === "string") {
                item = { name: item, url: item };
              }
              item.uid = item.uid || new Date().getTime() + temp++;
              return item;
            });
          } else {
            this.fileList = [];
            return [];
          }
        },
        deep: true,
        immediate: true,
      },
    },
    computed: {
      // 是否显示提示
      showTip() {
        return this.isShowTip && (this.fileType || this.fileSize);
      },
    },
    methods: {
      // 上传前校检格式和大小
      handleBeforeUpload(file) {
        // 校检文件类型
        if (this.fileType) {
          const fileName = file.name.split(".");
          const fileExt = fileName[fileName.length - 1];
          const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
          if (!isTypeOk) {
            this.$modal.msgError(
              `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
            );
            return false;
          }
        }
        // 校检文件大小
        if (this.fileSize) {
          const isLt = file.size / 1024 / 1024 < this.fileSize;
          if (!isLt) {
            this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
            return false;
          }
        }
        this.$modal.loading("正在上传文件，请稍候...");
        this.number++;
        return true;
      },
      // 文件个数超出
      handleExceed() {
        this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
      },
      // 上传失败
      handleUploadError(err) {
        this.$modal.msgError("上传文件失败，请重试");
        this.$modal.closeLoading();
      },
      test(arr) {
        this.fileList = arr;
      },
  
      // 上传成功回调
      handleUploadSuccess(res, file) {
        if (res.code === 200) {
          this.uploadList.push({
            name: res.data.data.name,
            url: res.data.data.url,
          });
  
          let fileInfo = {};
          fileInfo.filePath = res.data.data.url;
          fileInfo.fileName = res.data.data.name;
          fileInfo.fileSize = file.size;
          fileInfo.code = 1;
          this.$emit("update:syncedMessage", fileInfo);
          this.uploadedSuccessfully();
        } else {
          this.number--;
          this.$modal.closeLoading();
          this.$modal.msgError(res.msg);
          this.$refs.fileUpload.handleRemove(file);
          this.uploadedSuccessfully();
        }
      },
      // 删除文件
      handleDelete(index) {
        let delFile = this.fileList[index];
        if (delFile.code != 3) {
          delFile.code = 2;
        }
  
        this.$emit("update:syncedMessage", delFile);
  
        this.fileList.splice(index, 1);
  
        this.$emit("input", this.listToString(this.fileList));
      },
      // 上传结束处理
      uploadedSuccessfully() {
        if (this.number > 0 && this.uploadList.length === this.number) {
          this.fileList = this.fileList.concat(this.uploadList);
          this.uploadList = [];
          this.number = 0;
          this.$emit("input", this.listToString(this.fileList));
          this.$modal.closeLoading();
        }
      },
      // 获取文件名称
      getFileName(name) {
        // 如果是url那么取最后的名字 如果不是直接返回
        if (name.lastIndexOf("/") > -1) {
          return name.slice(name.lastIndexOf("/") + 1);
        } else {
          return name;
        }
      },
      // 对象转成指定字符串分隔
      listToString(list, separator) {
        let strs = "";
        separator = separator || ",";
        for (let i in list) {
          strs += list[i].url + separator;
        }
        return strs != "" ? strs.substr(0, strs.length - 1) : "";
      },
      initFile() {
        this.fileList = [];
        this.uploadList = [];
      },
    },
  };
  </script>
  
  <style scoped lang="scss">
  .upload-file-uploader {
    margin-bottom: 5px;
  }
  .upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
    z-index: 999;
  }
  .upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
  }
  .ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
  }
  </style>